Feature/lanes (#40)

this fixes #35

does not close but starts work partly on #41

Reviewed-on: #40
Co-authored-by: dutchie031 <timrorije@gmail.com>

src/classes/util/DcsUtil.lua

@@ -632,6 +632,12 @@ do     -- INIT DCS_UTIL
     ---@field b number
     ---@field a number
 
+    local drawID = 4210
+
+    function DCS_UTIL.GetNextDrawID()
+        drawID = drawID + 1
+        return drawID
+    end
 
     ---@param groupID number
     ---@param text string
@@ -677,6 +683,10 @@ do     -- INIT DCS_UTIL
     ---@param drawID number
     ---@param fillColor DrawColor
     function DCS_UTIL.SetFillColor(drawID, fillColor)
+        if fillColor == nil then
+            return
+        end
+
         local lineColorMapped = {
             fillColor.r or 0,
             fillColor.g or 0,

src/classes/util/Util.lua

@@ -128,6 +128,14 @@ do -- INIT UTIL
         return str:find('^' .. findable) ~= nil
     end
 
+    UTIL.endsWith = function(str, findable, ignoreCase)
+        if ignoreCase == true then
+            return string.lower(str):find(string.lower(findable) .. '$') ~= nil
+        end
+
+        return str:find(findable .. '$') ~= nil
+    end
+
     ---comment
     ---@param str string
     ---@param findable string